Ledger blade for pinking mechanisms



V. J. SIGODA LEDGER BLADE FOR PINKING MECHANISMS Jan. 19, 1954 Original iled Nov. 24, 1945 6 x. Y m m v 5 6 6 a \b/ 3 w 50 5- 8 8 2 4 w m 1 r W 2 l 1 m a M M K k 6 f 8 4 M w Av f||||l||\ i.

INVENTOR.

Victor J Sigoda BY attorneys Patented Jan. 19, 1954 LEDGER. BLADE FOR 'PINKIN'G V MECHANISMS;

Victor J. Sigoda, Great Neck, N. Y., assignor to Man-Sew Corporation, New York, N. Y., a corporation of New York Original application November 24,1945, Serial' No.630,635, now Patent No. 2,540,355, dated February 6, 1951. Divided and this application October 28, 1946, Serial No. 706,229

v.This invention relates to ledger blades and, in a preferred embodiment thereof, is designed for use in connection withpinking mechanism of the type disclose-d in my pending application, Serial No.630,635, filed November 24, 1945, now Patent No; 2,540,355, issued February 6, 1951, of which the subject matter of the present application is a division.

It is a prominent object of my invention to provide a ledger blade having shearing edges to cooperate with the cutting edges of a relatively movable cutting member, together with means on said ledger blade substantially coextensive with each shearing edge thereof to cooperate with the cutting member and tensionally stress the fabric material in the cutting or pinking operation. j

Another object is to provide a simple and inexpensive ledger blade construction, in which the said tensioning means comprises lands or ribs on the top surface of the ledger blade having the shearing edges formed thereon and spaced above the plane of said surface.

A furtherobjectresides in the provision of a' ledger blade having an integrally formed part thereof adapted to contact with the movable cutter to maintain an accurately assembled relation between the cutter and ledger blade and insure proper coaction of the cutter with the shearing edges of the blade, to prevent excessive frictional wear of the latter and obtain a clean sharp pinking cut. 7

It is an additional object, in one specific embodiment of the invention, to provide a ledger blade for use in combination with a toothed cutter mounted for movement about a fixed axis, said blade being formed with adjacent recesses through which the cutter teeth move, to cooperate with the shearing edges of one recess, and a part between said recesses for coaxial bearing contact with the cutter. I

In general, it is the aim and purpose of the present invention to provide a ledger blade for pinking devices having one or more of the above noted novel features and which will efficiently function to obtain maximum output of a high quality product with minimum waste and operating expense.

With the above and other subordinate objects in view, the invention comprises the improved ledger blade and the construction and relative arrangement of its several parts, as will hereinafter be more fully described, illustrated in the accompanying drawings, and subsequently i corporated in the subjoined claims.-

13 Claims. (01. 164-70) In the drawings, wherein I have disclosed one simple and practical embodiment of the invention, and in which similar reference characters designate corresponding parts throughout the several views: s

Figure 1 is a top plan view, illustrating one practical embodiment of the invention and showing my novel ledgerv blade in cooperatively assembled relation with the movable pinking cutter;

Figure 2 is a vertical sectional view taken substantially on the line 22 of Figure 1; and

Figure 3 is an enlarged plan view of the ledger blade.

Referring in further detail to the drawings, for purposes of illustration, I have shown a part of the bed Ill of a sewing machine upon which the pinking device or attachment is mountedat .the inner side of the stitch-forming mechanism of the machine. This attachment comprises the base plate l2, secured to the machine bed Ill by means of suitable screws 14. Upon this base plate, an elongated guide member i6 is adjustably mounted by means of the screws I8. Between this guide member and the base plate [2, the body portion 20 of a ledger blade is slidably confined for movement in a direction transverse to the feed path of the material to the stitchdownwardly through the openings 22 and 24 in the ledger blade section 20 and the machine bed respectively. In this bearing, the shaft 28 having a cutter head '36 integrally formed with or rigidly secured to the forward end thereof, is r0- tatably mounted. This cutter head is provided with one or more cutting teeth 32 of general triangular form or shape, and between said cutter head and the, forward end of bearing 26 a large diameter thrust washer and deflector 34 is preferably interposed. Any suitable means, driven from the main shaft of the machine or other source of power, may be provided for driving the cutter shaft 28, and, as herein shown, includes the drive shaft 36 connected to the rear end of shaft 28 by means of a suitable universal joint 38.

The ledger blade also includes a nose piece 40 which is integrally formed 1 with or detachably in confronting relation to the forward open end of the opening 22 in the ledger blade body sec-- tion 20. The notch 44 is bounded by a relatively" thick portion of the nose section 14.0, whichin the present instance is shown in the form of :8 narrow upstanding rib or land 48, substantially coextensive with each side edge of the notch.

These lands may be integrally joined at the apex of the notch as shown to form -a continuous land having its upper surface disposed in a common plane above and parallel with the top surface of the nose piece 40, and having a sharp shearing edge 50 extending along each side of the notch.

The juncture of the adjacent side edges of the adjoining notches M and .46, at the inner end of one of the lands .48, forms a reinforced bearin apex 52 adapted for axial thrust contact with the end of a hardened steel plug Bil-fitted in an axial bore in the cutter head 30.

Rearwardly of the bearing 26', guide member 16 is provided with an opening 56 through which an adjustable tension regulating device 58 mounted upon said guide member is connected to a pin or stud 50 fixed in the ledger blade body section 20. It will thus be understood that the point or apex 52 of the ledger blade nose piece :40 is yieldingly urged into constant bearing contact with the cutter head .30 at the axis thereof, about which the cutter teeth 32 move through the notches or recesses 44 and 46. a normal cooperative relationship between the cutting edges of the teeth stand the shearing edges .of the land #8 on the ledger blade is established and maintained so that overriding of said shear ing edges by the cutter :teethandrapid dul-ling thereof will be obviated. This tension-mg device,

more fully's'hown in application Serial No.63 0,635, is not claimed herein so that further detailed description is not required. However, :I preferably employ the improved formrof tensioning device described and claimed in my application Serial No. 587,455, filed July '31, 1946, now Patent No. 2,541,110, issued February 13, 1 951.

It will'be noted that the landssIB 'and the shearing edges 56 of the ledger blade are located-closely adjacent to the presser foot '62 and the stitch forming needle 64 of the sewing machine. Thus, when the Dresser foot is depressed upon the fabric, the lands :48 will act incocperation with cutter teeth 32 to more or less uniformly stress the fabric material over the shearing edges '50 as the two cutting edges :of each cutter tooth successively coact with the two shearing edges 50 of the ledger blade to iorm a pinking cut in the edge of the material. This feature has been found to be of particular practical iinporta-ncein the pinking of multiple plies or layers of silk, satin, or other synthetic fabric materials having exceedingly smooth or highly glossed surfaces, and insures accurate'registr'ation anduniformity in'thesi'ze of the pinking cut made in the fabric plies.

I the present instance, Ihav'e shown "the hated axis of the movable cutting member disposed at a vertical angle of substantially 10 degrees to the horizontal. It -willi-howcver be-.nnderstood that insofar as ethesubiect of the lurescut application is concerned, this movable or rotary cutter may be mounted in various other ways and provided either as a part of an accessory or attachment or mounted directl upon the machine bed. Similarly, the ledger blade may be of various other structural forms and also directly mounted upon the bed of the sewing machine.

From theforegoing description and the accompanying drawings, it will be appreciated that I have provided aledger blade construction which is simple and inexpensive and will efficiently cooperate with the movable cutting member to P k 01' out various kinds of fabric materials with a high degree of accuracy and minimum waste. Also maintenance cost is reduced to a minimum since, by forming the shearing edges of the ledger blade on the ribs or lands, said edges may be easily and quickly sharpened with a minimum of manual labor, as it is necessary to dress only the .top edges of the lands, instead of the entire surface of :the ledger blade.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated b the appended claims rather than by the foregoing description, and all changes which .come within the meaning and rangeof equivalency of the claims are therefore intended to be embraced therein.

What is claimed and desired to be secured by United .States Letters Patent is:

1. .A ledger blade for fabric pinking devices having shearing edges defining a pinking notch and means projecting above the ,top surface of Said blade for uniformly tensiomng the fabric in contact withsaidshearing edges.

:2. Tbe ledger blade defined in claim 1, wherein said shearing edges and .the fabric contacting surface of said tensioni-ng means are disposed 111:3 common plane above the plane of said top surf ace ofsaid blade.

3. The ledger blade defined in claim 1, wherein sa d tensioning means comprises an upstandzmg rib lor land substantially parallel to and coextensive with each of said shearing edges.

:...A :ledger blade for fabric pinking devices havi a pinking notch bounded by .an adjacent part of the blade structure having a fabriccontacting surface disposed above the plane of the tQpss rface of the blade and formed with shearn e es substantially coextensive with the :re- .spectiveedges ofthepinking notch.

-..A l d er :blade :for fabric pinking devices having a pinkins notch and -.a continuous upstan ing rib or :land ,on :the :top surface of the blade boundin :said notch and provided with shearing edges substantially coextensive with the r sp ctive edges .or the Dinking notch.

6. A ledger blade for -;fabric pinking devices having apinking notch of all-shaped form and upstanding ribs or lands formedon said blade and ,each p ovided :at its top surface with a shearing edge extending along one side edge of ymtovidedzwith.shearingedges, said shearingedges .proj,ecting above :the top-surface of said blade ;.for uniformly tensioning :the fabric in contact with said :shearing ledges.

8. The ledgerbladedefined in claim"? in which 5 said shearing edges are part of an upstanding rib or land substantially parallel to and coextensive with each of said shearing edges.

9. A ledger blade for fabric pinking devices provided with adjoining notches, one of said notches having a continuous upstanding rib or land raised above the top surface of the blade bounding said notch, said land being provided with shearing edges substantially coextensive with the respective edges of the pinking notch.

10. The ledger blade defined in claim 9 in which one end of said raised land forms a bearing apex for a mating cutter rotatable about said apex.

11. The ledger blade defined in claim 9 in which the end of the raised land at the junction of the adjoining notches forms a bearing apex for a mating cutter rotatable about said apex.

12. The ledger blade defined in claim 9 in which the end of the raised land at the junction of the adjoining notches is provided with a pyramidally shaped bearing apex for a mating cutter rotatable about said apex.

13. The ledger blade defined in claim 9 in which the end of the raised land at the junction of the adjoining notches is provided with a pyramidally shaped bearing apex for a mating cutter rotatable about said apex, one face of which lies in the plane of said land above the surface of the blade and whose other intersecting faces are angularly ofiset with respect to said plane.

VICTOR J. SIGODA.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,886,422 Popper Nov. 8, 1932 1,909,346 Gruman May 16, 1933 1,956,677 Gruman May 1, 1934 1,978,291 Bowman Oct. 23, 1934 2,049,351 Brussell July 28, 1936 2,095,570 Moulton Oct. 12, 1937 2,239,743 Sigoda Apr. 29, 1941 2,297,372 Stevenson Sept. 29, 1942 2,540,355 Sigoda Feb. 6, 1951 

